Do you know if the real cart is as quiet when it comes to the expansion audio vs the internal audio? On an original Famicom, the mapper's expansion audio from the EverDrive is very quiet in relation to the internal audio.

Do you know if the real cart is as quiet when it comes to the expansion audio vs the internal audio? On an original Famicom, the mapper's expansion audio from the EverDrive is very quiet in relation to the internal audio.

The VRC7 board attenuates the 2A03 audio quite a bit. In that video it's balanced way too loud relatively, though probably you're going to have trouble getting loud enough output from the Everdrive to do it right. There's some reference recordings here:http://forums.nesdev.com/viewtopic.php?t=8639

The VRC7 board attenuates the 2A03 audio quite a bit. In that video it's balanced way too loud relatively, though probably you're going to have trouble getting loud enough output from the Everdrive to do it right. There's some reference recordings here:http://forums.nesdev.com/viewtopic.php?t=8639

yeah, I know.

The problem is that I can only adjust the volume in the digital domain, and in this regard, I'm already utilizing the full 13-bit range of my Delta-Sigma converter.

Meaning, if it needs to be louder, I have to scale the volume beyond the range of my converter, which means clipping the output when too many channels are played. I'm honestly not so fond of this idea.

Maybe I can find some trick by playing with the I/O drive strength and using a combination of push-pulling and tristating the audio pin.

Yeah, part of the problem is the VRC7 itself has a HUGE dynamic range from its logarithmic volume function.

6502freak wrote:

I have to scale the volume beyond the range of my converter, which means clipping the output when too many channels are played. I'm honestly not so fond of this idea.

I have not yet done testing on this (VRC7 is the last big reverse-engineering challenge in my plans for NSFPlay, still pending) but I've had reports that if you play it too loud it does end up distorting.

Even just clamping the max channel volume at ~11 might claim back a bit of headroom that Lagrange Point isn't using much.

This isn't the first complaint I have heard of the EverDrive N8's quiet audio. Perhaps an amplifier mod, similar to the one used for earlier versions of the SD2SNES, would alleviate quiet expansion audio issues.

Old-school Xilinx CPLDs are sized in macrocells. Each macrocell corresponds roughly to one bit of state or one multiplexed output pin. Resources in a Lattice CPLD aren't quite so simple to estimate from the size of state, but here goes nothing.

An Altera Max II EMP240 has 240 Logic Elements and will run you $7.50 on Mouser for the lowest-end chip in the family. Using Tepples' example, which has 115 bits, you should be able to fit everything onto the cheapest chip. This is using Altera's estimate of 240LEs = 128-240 MCs, avg. 192MCs. Could you fit the slightly more advanced capabilities of an AY-3-891x sound core?

Very Well.BTW, Is it possible to simulate VRC7 FC Sound with a altera or xilinx cpld？

The EverDrive N8 uses an Altera Cyclone II FPGA, but FPGAs are much more capable devices than CPLDs.

My core is currently using 2910 LEs, which is beyond the capacity of any known "real" CPLD. Especially if you target the "desirable" 5V tolerant ones.

Btw, (in case you wonder) the reason why I am not posting at the Everdrive forum aswell is the failure to get my account reactivated (sent numerous password reset requests, but no response). If somebody would kick the admin, I might actually be able to answer to any kind of bug reports...

Who is online

You cannot post new topics in this forumYou cannot reply to topics in this forumYou cannot edit your posts in this forumYou cannot delete your posts in this forumYou cannot post attachments in this forum